According to Variety, the production is shooting once again with Johnny Depp, Colin Farrell, and Jude Law each taking a portion of the role that Ledger had yet to film. The transition from Ledger to each of the other actors occurs in the story when the character falls through a magic mirror into parallel worlds of the imagination.

The project is a modern-day adventure that revolves around the titular Doctor, a travelling magician to be played by Christopher Plummer, who owes the devil his teenage daughter in exchange for his extraordinary powers. The doctor, his daughter and a charming stranger embark on one final quest in a bid to escape the devilish deal.

Finally finishing his movie: Terry Gilliam

Tom Waits, Andrew Garfield, Lily Cole, and Verne Troyer also star.

In a statement released to Variety, producers William Vince, Amy Gilliam and Samuel Hadida said: "Since the format of the story allows for the preservation of his entire performance, at no point will Heath's work be modified or altered through the use of digital technology. Each of the parts played by Johnny, Colin and Jude is representative of the many aspects of the character that Heath was playing."

"I am grateful to Johnny, Colin and Jude for coming onboard, and to everyone else who has made it possible for us to finish the film," Gilliam said.